The attacker has been named as 31-year-old Tunisian-born Mohamed Lahouaiej Bouhlel.

He was shot dead by police in a hail of bullets.

No group has claimed responsibility for the carnage, but French officials called it an undeniable act of terror.

The assault on revelers in the southern French city rocked a nation still dealing with the aftermath of two attacks in Paris last year that killed 147 people and were claimed by the Islamic State extremist group.

Eric Gaillard / Reuters

French police forces and forensic officers stand next to a truck July 15, 2016 that ran into a crowd celebrating the Bastille Day national holiday in Nice, France.

Eric Gaillard / Reuters

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The truck which slammed into revelers.

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In this video grab taken Thursday July 14, 2016, ambulances and Police cars are seen after a truck drove on to the sidewalk.

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A policeman chases people out of the cordoned-off area.

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French soldiers stand guard.

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Police officers seal off the area.

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A police car is parked near the scene of the attack.

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Police officers secure the scene.

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Ambulances line up near the scene of the attack.

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Police officers and soldiers block the access to the scene.

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Eric Gaillard / Reuters

French police forces and forensic officers stand next to the truck.

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A forensic officer stands near a van with its windscreen riddled with bullets.

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A man runs near the scene of the attack.

Eric Gaillard / Reuters

Bodies are seen on the ground.

Eric Gaillard / Reuters

Eric Gaillard / Reuters

Eric Gaillard / Reuters

French soldiers cordon the area.

Eric Gaillard / Reuters

Eric Gaillard / Reuters

Eric Gaillard / Reuters

Eric Gaillard / Reuters

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A woman cries asking for her son as she walk near the scene of an attack.